package com.shujia.util;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5 {

    public static void main(String[] args) {
        String java = md5("java");
        System.out.println(java);
    }

    /**
     * 对字符串进行md5加密的工具
     *
     * @param plainText
     * @return
     */

    public static String md5(String plainText) {

        //加盐
        String s = plainText + "asdasdasdasd";

        byte[] secretBytes = null;
        try {
            secretBytes = MessageDigest.getInstance("md5").digest(s.getBytes());
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("没有这个md5算法！");
        }
        String md5code = new BigInteger(1, secretBytes).toString(16);
        for (int i = 0; i < 32 - md5code.length(); i++) {
            md5code = "0" + md5code;
        }
        return md5code.toUpperCase();
    }
}
